HYMENOPTERA. 421 



triangle. Thorax : the collar slightly interrupted, the tubercles, 

 a line at the base of the scutellum, and the ])Ost-scutellum, yel- 

 low; the mesothorax and scutellum coarsely imnctured; the 

 metathorax with an enclosed space at its base and a broad longi- 

 tudinal channel which is transversely carinatcd, and entirely 

 coarsely rugose; the wings fulvous, the nervures and tegulse 

 ferruginous ; the legs reddish-yellow, the femora darkest, the 

 apical joints of the tarsi fuscous. Abdomen finely punctured ; 

 the first and second segments with a lateral ovate yellow spot in 

 the middle ; the third, fourth and fifth segments with a narrow 

 line on each side in the middle, the lines extending further in- 

 wards on each successive segment. 



Hab. Georgia. 



141. Crabro advena. ^ B.M. 



Female. Length 41 lines.' — Black : the head with fuscous 

 pubescence ; the scape, clypeus, and a stripe on the mandibles, 

 yellow ; the clypeus covered with silvery pubescence ; the ocelli 

 in a triangle on the vertex. Thorax : a slightly interrupted line 

 on the collar, tubercles, and a transverse stripe at the base of the 

 scutellum, yellow ; the mesothorax closely punctured, the meta- 

 thorax very coarsely rugose ; the tibise and tarsi yellow, a fuscous 

 spot on the tibise beneath at their apex ; the apical joints of the 

 tarsi rufo-fuscous ; the wings fusco-hyaline, the nervures and 

 tegulse ferruginous. Abdomen : the first, second and third seg- 

 ments with an interrupted yellow band placed a little behind the 

 middle ; the fourth and fifth segments with a yellow fascia on 

 their apical margins ; the apical segment forming an elongated 

 triangle, obtuse at the apex and longitudinally rugose ; beneath, 

 smooth, shining and impunctate. 



Male. — The clypeus and mandibles black ; the flagellura ful- 

 vous beneiith, with the second, third, fourth and fifth joints 

 produced into a tooth at the apex ; the punctures of the meso- 

 thorax running into elongate striae ; the thorax beneath covered 

 with hoary pubescence ; the anterior femora are ferruginous 

 within, black behind, and have a yellow stripe beneath ; the in- 

 termediate femora yellow at their apex ; the tibiae are yellow 

 above and black beneath ; the tarsi yellow, their apical joints 

 fusco-ferruginous ; all the segments of the abdomen with yellow 

 fasciae, the first four slightly interrupted. 



Hab. Nova Scotia. 



142. Crabro unicolor. B.M. 

 Female. Length 6 lines. — Black : the head and thorax opake ; 



